The pressure-versus-time curve in the figure represents which of the following ventilator modes?

a. Airway pressure-release ventilation
b. Pressure-support ventilation with contin-uous positive airway pressure
c. Pressure-controlled intermittent mandato-ry ventilation plus pressure support
d. Volume-controlled intermittent mandatory ventilation plus pressure support


ANS: A
Airway pressure-release ventilation provides two levels of continuous positive airway pressure while allowing the patient to breathe spontaneously at both continuous positive airway pressure levels. The sine waveforms at both continuous positive airway pressure levels represent the spon-taneous breathing of the patient. The higher continuous positive airway pressure level is usually held longer than the lower continuous positive airway pressure level—hence the term airway pressure release.

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